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Schematic of the experiment. A cobalt magnet with cross section 225×79 nm2 was extended past the leading edge of an attonewton-sensitivity cantilever. The cantilever was centered over a 1 μm-wide microwire coated with 40 nm of polystyrene. An external 2.63T magnetic field was applied in the direction of the long axis of the cantilever as shown. A laser interferometer was centered on a 30 μm-wide pad to measure cantilever vibrations.
